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Is it the sensor of air in the fuel rail. Have the fault codes read.Replace the faulty units with genuine one because most aftermarket units are not set for OEM cpu units and are not completely compatible

Your control switch is bad. This is a bad problem with chevys. Even earlier year models had the same problems. I wouldnt get one new, call your local salvage yard and get a used one. Please rate answer accordingly!! Thank you

Could also be that you are out of Freon, Compress may have a leak. Try it on cold setting in the early morning if its not even cool and heats up fast then Rob is correct. ITs a damper/ temp problem which is eternal. You can tear apart you dash and check on the damper (looks like a doggie door) make sure nothing is in the way and the hinger isnt broken.....I hope you can fix it yourself..